COLREG’s is an international document derived from a treaty called the Convention on the International Regulations for Preventing Collisions at Sea in 1960 and was published by IMO (International Maritime Organization) in 1972.
It defines and sets rules to be followed by all vessels on the water to prevent collisions between vessels. It also refers to the specific political line that divides inland waterways and coastal waterways. This reference is important because inland waterways have their own rules and coastal waterways have to abide by international navigation rules. It’s important to state that in Canada, that inland waterways follow the same rules set in this document.
In Canada, the COLREG’s and the Canadian Modifications are provided by Transport Canada, an organization that regulates all Canadian vessels.